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Study populations
| City, Country | Ethnic group | Cases | Controls |
|---|---|---|---|
| London, UK | Gujarati Asian | Adults (n=123) | Adults (n=140) |
| Cape Town, South Africa | Xhosa | Children (n=210) | Children (n=163) |
| Cape Coloured | Children (n=71) | Children (n=19) | |
| Rio de Janeiro, Brazil | White | Adults (n=55) | Adults (n=49) |
| Mixed | Adults (n=44) | Adults (n=18) | |
| Black | Adults (n=31) | Adults (n=11) |
